关键词: 三联表面活性剂, 蠕虫状胶束, 微结构, 性能评价

Abstract: Wormlike micelles(WLMs)with polymerizable group were formed in aqueous solutions of cationic trimer surfactant di(2-hydroxyl-dimethylene ether)-α,ω,γ-triple(dimethylcetylammonium chlorine),referred to as Trimer_C16 by addition of sodium p-styrenesulfonate(NaSS).Then,styrene(S_t)monomer was solubilized into the hydrophobic core of the WLMs,presumably as the reactor for the polymerization reaction.The effect of polymerization temperature(T_p)and solubilization quantity of S_t on apparent viscosity(η_a)of the Trimer_C16/NaSS/S_t polymerized system were studied with the viscosimetry method,and the properties of the solutions before and after polymerization were evaluated.The optimal molar concentration ratio of Trimer_C16 to NaSS was 1/1.6,and the optimal T_p and solubilization quantity of S_t were 45℃ and 0.15 g,respectively.When shearing for 60 min at 170 s^-1 shear rate in the range of heating from 70℃ to 100.5℃,η_a of the solutions after polymerization was 82.5 mPa·s.However,the η_a of the unpolymerized system without S_t decreased to 5 mPa·s after shearing for 30 min.When sand carrying ratio was 10%,sedimentation rates of seeds in the systems before and after polymerization were 0.385 cm·min^-1 and 0.128 cm·min^-1 at 50℃,respectively.Improved temperature and shear resistance,and sand carrying property of the polymerized system was due to the "lock-in" of WLMs microstructure by the polystyrene line produced in the micelles core and the Trimer_C16-NaSS copolymer line bridged between core and shell.

Key words: trimer surfactant, wormlike micelles, microstructure, properties evaluation